vice-president biden, then candidate biden crushed hillary clinton and barack obama in the debates. he was the one winning the debates. >> he's a very strong debater. i'm sure that that's the biden that will show up this week, but part of the problem that a president and a vice-president faces is that they can be insulated very easily. they speak to crowds that adore them. >> right. >> they aren't orphanage challenged with tough questions from reporters as we've seen lately and i think that's a big challenge for biden this time around. >> historically the vice-president debates, i think, vealyielded a lot more entertaining moment and some think they'll stand out more. >> lloyd benson and dan quayle, 2002008. >> jack kennedy was a friend of mine. senator, you're no jack kennedy. (cheer (cheers) >> that was a fierce moment. >> that was a strong zinger and perhaps the most memorable moment from the vice-presidential debate and often, a vice-presidential debate is about assurance. can the second person on the ticket become president and step in if need be. you've got to remember in 1988